Battery vent cap



A ril 30, 1935. NS. AMIDON I I 1,999,952

BATTERY VENT CAP Filed Sept. 28. 1932 INVENTOR. Norman SAW-Lilian I /WATTORNEYS.

Patented Apr. 30, 1935 h t v UNITED STATES PATENT OFFICE 1,999,952BATTERY VENT CAP Norman S. Amidon, Lapeer, Mich. Application September28, 1932, Serial No. 635,271 2 Claims. (Cl. 136-177) This inventionrelates to vent caps and more l8 extends up into the chamber 2| ofthefbattery particularly to vent caps employed on storage to slightlybelow the cover l2.

batteries. The terminal connector B may be the ordinary The principalobject of the invention is to proring, usually split, which encirclesthe battery vide a vent cap having novel means to prevent post terminal.5 harmful battery acid laden moisture from reach- As for the improvedvent cap C, the same ining the exterior of the battery. cludes a mainbody portion 30, preferably cy- Another object is to provide such a ventcap, lindrical, one end (the lower) being provided comprising but twoinexpensive and very easily with means to attach it to the battery coverl2,

l1) assembled parts. such means in the example shown being screw 10Another object is to provide a vent cap having threads 3L Above theseScrew threads, the ythe above features but which cap has nodependlindrical body portion 30 is provided with a coling portionprojecting into the battery chamber. & 32 w ch n be g asped by'the handor a Still another object is to provide a vent cap, tool to rotate thevent n Next above the collo the outwardly projecting portion thereofbeing lar 32 is a pripheral groove 33 and it can be seen of material notsubject to fracture when struck, from Figure 1 t 0011811, i ddit o toits nor easily damaged, and which will yield if an Ordinary function.also provides, What might be object comes t t t therewith termed acontinuation of the grooved wall. This Another object is to provide anovel vent cap p ripheral gro v 33 15 Preferably at the pp having theabove features and which is provided end of e main body DOTtiOn A fi d p0 with a vent well above the top of battery posts opening is providedthru the m b dyn: and connections but which elevated vent will not d peferably compr es a axially disposed e entail the disadvantages incidentto a rigid vent extending thru the main body p r o Where cap projectinghigh above a battery it opens, at its lower end, into a chamber-erre-Other objects and advantages will be apparent c955 35 within the mainbody h The lower during the course of the following detailed deend ofthe chamber 35 i p id d with ab fi scription, taken in connection withthe accomwhich may have perforations 31 Similar panying drawing fg mj apart of this e ifl a openings. However, it should be understood that n 2in which the chamber 35 and the perforated baflle 36 are Figure 1 is avertical sectional View f the of conventional construction, theconstruction of 3 improved vent cap applied to a conventional this novelVent D r q r n onlyasmall passagestorage battery, shown in fragmentaryvertical way fluid escape opening extending from the t lower end. of themain body portion to the upper Figure 2 is an elevation of the improvedvent end .thereof- Disposed in the upper end of the cap, main bodyportion is a sump 38 or drain having 35 Figure 3 is a top plan view ofthe same. i wardly slopi Walls a d leading to pp In the drawing, whereinfor the purpose of 11. or outer end of the vent 34. It will be notedthat lustration is shown only a preferred embodiment the p extflnds t0 hv ry e f h m in of the invention, the letter A designates a conbodyportion just above the groove 33. The main ventional storage battery, Ba terminal connector body portion 30 is preferably of molded rubber, or40 and C the improved vent cap. similar rigid material. I

The storage battery A includes side walls Hi The sump 33 and upperend ofthe fluid escape and l l and a cover .12 through which project theopening (vent 34) is enclosed by a hollow member spaced apart positiveand negative terminal posts which preferably comprises a soft rubberball l3 and I4 connected to.conventional post straps 40. The ball has anelastic or stretchable mouth l5 which are separately connected to theposill which may haveathickened or reinforced edge tive and negativebattery plates l6 and I1, these adapted to contact with the walls of thegroove being immersed into the electrolyte l8, which is 33, providing atight seal between the main body ordinarily an acid, such as sulphuricacid, in soportion 33 and the hollow member. It will be so lution.Spaced from the posts l3 and I4 is an seen that the ball cannot bepushed down too opening IS in the cover l2 which may be screw far on themain body portion because of the collar threaded as shown. A gasket '20is ordinarily 32 and that the concaved inner surface of the ballprovided to encircle the outer end of the openaffords an easy andunobstructed transition be-- ing is. As shown in Figure 1, theelectrolyte tween the said surface and the sump 38 so that 55 interferewith the operation.

en in use, acid fumes and acid laden' air The two-piece vent cap may bemanufactured cheaply and assembled in little time and the ball portionthereot'may be easily renewed it necessary.

Various changes may be made to the invention herein shown and described,

form of without departing from the scope 01' the claims What is claimedis:

spirit of the invention or the with the inner surface of said membermeeting the surface of said sump.

NORMAN S. AMIDON.

